Unfortunately having a long range cartridge does not make one competent at long range.It sounds like the people you are describing are slob hunters and not long range shooters.As for the 500 yard plus shots were they measured with a laser rangefinder or are the ranges just guessed at?I find that many long shots decrease in range dramatically when they are actually measured.Many supposed 500 yard shots suddenly become 300 yards when a rangefinder is used.